Rendering process



@do 9 M23, llm J. LISTER RENDERING PROCESS Original Filed June 9, 1917 5 Sheets-Sheet l WITNESSES;

@diy 9 9 E923 v ALQQ@ J. LISTER RENDERING PROCES S Original Filed June 9A, 1917 3 Sheets-Shea?l 2 J. LISTER RENDERING PROCESS Original Filed June 9, 1917 3 Sheets-Sheet 3 ml/ENTOR;

WITNESSES.-

" da ATToRN JOSEPH LISTJER, DECEASED, LATE F CHICAGO, ILLNOIS; BY mmm' lU'll0R, OIF CHICAGO, ILLJINOEIS.

RIENDJERXNG PROEESS. I

Application tiled June 9, 1917, Serial No. 173,734. Renewed February 9, that.

To all whom t may conern:

Be it known that JosnrH Lrsrnn recently deceased, a citizen of the United tates, re-

siding at Chicago, in the county of Cook and State ot Illinois, didinvent certain new and useful Improvements in Rendering Processes, of which the following is a specifcation.

This invention is concerned with certain` l0 novel processes which are adapted to be carried out conveniently by the use of a tank and connections, which tank will be illustrated and described, together with the novel process of rendering tallow which may be carried out thereby.

To illustrate the aforesaid invention, three sheets of drawings are annexed hereto, in which the same reference characters are used to designate identical parts in all the 2@ gures, of which,-

Fig. 1 is an end elevation of the tank; Fig. 2 is a side elevation of the same; and Fig. 3 is a longitudinal central vertical section.

ln carrying out the aforesaid invention, a cylindrical tank 15 may be employed, which is provided with heads 16 and 17, each of said heads having suitably secured thereto the trunnions 18 and 19, which trunnions 39 are preferably hollow and constructed with the stufling-box caps 2O and 21, which are adjusted to compress the packing, lnot shown, about the stationary pipes 22 and 23 by the set screws 24 passing through 35 the caps 20 and 21 and threaded into the ends of the trunnions 18 and 19. The inner end of the trunnion 19 opens into the short pipe 25, rigidly secured in the tank| in any desired manner, as by being screwed 4@ into the end of the plate 26 secured on the inner end of the head or end 17. A radi ally extending pipe 27 is connected to the pipe 25, as by the elbow 28, and a longitudinally extending pipe 29 at the periphery M is connected to the pipe 27 by the elbow 30. As a convenient means of holding the pipe 29 from movement, l secure it by the loops 31 passed around it and extended through the wall of the tank 15. This projecting loop serves'to show at all times the position of the pipe 29. The pipe 29 terminates at substantially the center of the length of the tank, and is connected by an elbow 32 and a 'l' 33 with a'n elongated perforated pipe 1, which is also prefera'bly secured from movement by the loops 35 Asnrrounding it and passed through the wall oil the tank. By the connections shown, it will be obvious that a lluid can be passed into the ,tank through the pipes'23, 25,27, 29 and 1, or, by a reverse movement, withdrawn therefrom. 'llhe pipe 23 has a vertical eXtension 36, in which is located a cock 37 connected to the test or discharge pipe-12.

rllhe upper end of the pipe 36, or a continuation thereof, is connected to the header pipe 38, which pipe has connected thereto by elbows or Ts, as may be required, the steam supply pipe 3, the grease discharge pipe 1, the glue discharge pipe 5, the hotwater supply pipe 6, and the gas discharge pipe 11i. All these pipes are supplied with i stop cocks, as shown, and it will be understood that the hot-water pipe 5 is connected to a supply of het water; the glue discharge pipe 5 is adapted to discharge into some suitable receptacle for the' further treatment of the glue; the grease discharge pipe l likewise discharges into some receptacle :tor the grease; the steam supply 'pipe 3 is connected to asupply or live steam, and the gas discharge pipe la terminates atsorne point, pref-arabi` outside or the plant, where. ammonia gas, i it is not preserved, can be discharged without inconvenience. lin the pipe 14 below the valve, l place the pressure gauge 39, which, when the cock d0 in the pipe 36 is open, will show the pressure in the tank. The tank 15 is proin'ded with the customary manhole 11, which may be closed by the customary solid cover; or Toy a special perforated cover 41, indicated somewhat diagrammatically in lFig. 2.

' The other end of the tank .is provided with a short pipe d2, like the pipe 25, which is suitably connected to the radial pipe d3,

ldd

the compressed-air supply pipe-10, 'each et these pipes 7, 8, 9 and 10 being provided above the header 46 with the shut-off valve and it will be understood that the pipe 7 can be connected to a supply of hot water, or sometimes to a supply of liquor water; the cold-water supply'pipe 8 is connected to a supply of cold water; the steam supply pipe 9 to a supply of live steam; and the air pipe 10 is connected to a supply of com pressed air. a

As seen 'in Fig. 3, the interior of the tank may be provided with the inwardly pro3ecting plates 47, to lift the contents of the tank as it is rotated, it being yprovided with the spur ar wheel 48 secured on the trunnlon 19, w ich gear wheel is driven b the .spur gear pinion 49 secured on the sha t 59 )ournaled in suitable bearings on the ramework 51, and having the belt pulley 52 on the outer end thereof, by which power is applied to the drum to rotate the same. 1t will be noted that the pipe 2 is diametrically opposite to the pipe 1, and that the relative positions of the pipes 1 and 2, whether at the top, bottom or side of the tank, can' always be ascertained by reference to the loo s 31 and 35.

o illustrate how the tank is used in my novel method of rendering tallow, the following description is given. The tank will be artially filled with the material, which inc udes all classes-of tallow, caul, mecca, kidney, flank, and various gristly fat parts from cattle and sheep. If the material is dirty, it ma be washed by closing the manhole 11 wit the perforated screen 41, and with the manhole at the topthe valve 8 is opened and the tank filled with cold water, after which it is revolved until it is emptied by the water escaping through the perforated cover of the manhole. This washing process may be repeated two or three times, as often as is necessary to remove blood, salt, and impurities generally.

After it is washed, the manhole is turned to the top, and the perforated cover is removed and the solid cover put in place; the valve 3 is opened, with the pipe 1 standing at the bottom, and the live steam is admitted to scald the contents. The pressure is' raised to forty pounds, as indicated on the gauge 39, after which the valve 3 is closed. The tank is rotated to bring the pipe 1 to the top, after which the valve 14 is opened, and the accumulated gas and steam blown off, after which the tank is turned to bring the pipe to the bottom, after which the valve 3 is opened, admitting steam until thc pressure is raised again to forty pounds. The valve 3 is then closed, and the tank turned to bring the pipe 1 to the top, after which the valve 14 1s opened long enough to blow out the gas and allow the pressure to fall to twenty pounds, after which the tank is turned to bring the lpipe 1 to the bottom, in which position the tank is allowed to stay for\onehalf hour, until the fluid contents are stratified.

Y The valve 5 is now opened, and the pressure in the tank forces out the glue liquor which occupies the bottom of the tank. The run of the liquor has to be watched, and at the end, when the overlying tallow begins to appear, the valve4 5 has to' be closed, and the valve 6 is opened, and a certain delinite quantity of hot water, enough to half fill the tank, is admitted, after which, with the pipe 1 remaining on the bottom, the valve 3 is opened and' .steam admitted to raise the pressure to forty pounds. The tank is then turned yto bring the pipe 1 to the top, after which the valve 14 is opened, and the gas and steam blown off. The valve 14 is then closed and .the tank turned to bring the pipe 1 to the bottom of the tank, after which the valve 3 is opened and steam admitted until the pressure 1s raised to forty pounds, after which the tank is allowed to remain stationary for three hours with the pressure held at forty pounds. The tank is then turned until the pipe 1 is at the side, and the fat will be fioating on the top of the water, which half fills the tank, as previously mentioned. The valve for the pipe 4 is then opened, and the internal ressure forces the tallow ofi' of the top o the water or liquor in the tank, and then the valve is closed. The tank is then turned to bring the pipe 1 to the bottom, after which the valve 3 is opened and steam admitted to raise the pressure to forty pounds. The valve 3 is closed, and the valve or pipe 12 is opened, and the pressure forces all the water out. When the water is all gone, some grease will follow it, and when it appears, the valve 12 must be closed and the valve 4 opened, and the grease discharge-'l through the pipe 4 to a suitable receptacle. The tank isthen turned to bring the pipe 2 to the bottom, and the valve 9 is opened, and steam flows through the tank, penetrating.r through the tankage to pipe 1 for one an-l a half to tWo hours, at the end of which time only a dry steam will come from the pipe 14, which is then closed, after which the manhole plate is removed, and the tank is revolved until the tankage contents are discharged therefrom.

While I show a preferred form of tank for carrying out said process and the rendering process is likewise described in its preferred embodiment, it will be understood that different forms of tanks or apparatus may be employed and that the process is capable of some modifications, and that the patent is not to be limited to the exact steps disclosed, but only as may be necessitated by the state of the prior art.

What it is desired to claim as new is:

1. A rendering process which consists of lll rgeroaae (l) treatin the stock by the direct action of steam; 2) allowing the stock to settle while kept hot but without dilution; (3l drawing olf hot, undiluted glue liquor; 4) treating the stock by the direct action of steam; (5) adding hot water to iioat the tallow above the residue; and (6) skimming H the tallow.

2. A tank rendering process consisting of (1) cooking the stock 1n steam and agitating it to free the fatsA and glutinous materials from the residue; (2)" allowing the stock to settle for thirty minutes under twenty pounds steam pressure; (3) drawing olf the lue liuor from the bottom of the tank; la) ad ing hot water to half fill the tank and oat the residue; subjectingl it to forty pounds steam pressure for three ours; and (6) skimming olf the tallow.

3. A tank rendering process consisting ot (1) cooking the stock 1n steam and agitating it to free the fats and glutinous materials from the residue; (2) allowing the stock to settle for thirty minutes under twenty pounds steam pressure; (3) drawing off the glue liquor from the bottom of the tank; (4) addin hot water to half fill the tank and iioat t e residue; (5) subjecting it to forty pounds steam pressure for three hours; (6) skimming olf the tallow; (7 drawing oif the water; (8) drawing oi the remaining grease; and (9) steaming the residue or one and one-half hours.

4. A rendering process consisting of (1) treating stock by steam under pressure; (2) allowing stock to settle; (3) forcing od undiluted glue liquor from the bottom by pressure on the top of the stock; (4) treating remainder of stock by water and steam under pressure; (5) forcing oii the tallow by pressure; (6) driving ofi water by pressure; and (7 driving oi the balance of the tallow by pressure.

5. A novel rendering process which consists in (1) washing the stock; (2) scalding the stock; (3) steaming the stock under pressure; (4) releasing the pressure and discharging vthe gas; (5) steaming the stock under pressure; (6) reducing the pressure; (7 allowing the Stock to stratiy; (8)! drawing oif glue liquor; (9) adding water; (10) steaming the stock' under pressure; (11) releasing the pressureA and gas; (l2) steaming the stock under pressure for three hours; (13) skimming olf the tallow by pressure; (14) driving the water off by pressure; and driving olf the balance of the tallow by pressure.

gelatinous materials,

6. A tank rendering process for fats and which consists oi' (1) cooking and agitating the stock without the addition of water to free said fats and gelatin from the residuum; (2) allowing the materials to stratify without solidifying; (3) drawing oil the glue liquor from the bottom; (4) adding hot water to oat the fats above the residue; (5) and skimming oil' the fats from above the residue and the water.

7. A tank rendering process for fats and gelatinous materials, which consists of (l) cooking and agitating the Stock without the addition of water to free said fats and gelatin from the residuum; (2) allowing the materials to stratify without solidifying; (3) drawing oflt the glue liquor from the bottom; (4) adding hot water to float the fats above the residue; (5) skimming olf the fats from above the residue and the water; (6) drawin otl the water; and (7) steaming the resi ue.

8. A tank rendering process for fats and gelatinous materials, which consists of (1) cooking and agitating the stock without the addition of water to free said fats'and-gclatin from the residuum; (2) allowing the materials to stratify without solidifying; (3) drawing ofi the glue liquor from the bottom; (4) addin hot water to float the fats above the resi ue; (5) cooking the remaining contents under pressure; and drawing ofi' the fats from above the resi ue and water.

9. Atank rendering process which consists in (1) washing the stock in cold water; (2) scalding it with live steam at a pressure of forty pounds; (3) blowing ofi' the steam and gas; (t) scaldin it again with live steam at a pressure o forty pounds; (5) blowing off the steam and gas; (6) settling Afor thirty minutes at twenty pounds of steam pressure; (7 drawing oli' the glue liquor trom'y the bottomV of the tank; (8) adding hot water to half fill the tank; (9) admitting steam to raise the pressure to forty pounds; (10) blowing ofi the steam and gas; (11) admitting steam to raise the pressure to forty pounds and holding it' at that pressure for three hours; (12) skimming oli the tallow; (13) admitting steam to raise the pressure to forty pounds and force out the water; (14) drawing ofi' the remaining grease; and (15) steaming the residue for one and one-half hours.

EDWIN Lis'rna, Emecutor of Joseph Lister, Deceased.

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